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Date:	Wed, 15 Dec 2010 17:10:14 -0700
From:	Eric Blake <eblake AT redhat DOT com>
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Subject:	Re: Test command giving inconsistent results.
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On 12/15/2010 05:04 PM, Andy Hall wrote:
> This is one in the same vein as the one I reported back in October.
>=20
> The test command is giving different results depending on the path used.

I'm not yet sure if it is a bug, or just a flaw in your expectations.

>=20
> ahall AT ahall-pc /cygdrive/c/Program Files/Java/j2sdk1.4.2_16/bin
> $ ls -l
> total 1320
> ... <Some files deleted for clarity>
> -rwx------+ 1 ahall None 45168 2007-09-17 02:27 java.exe
> ... <More files deleted for clarity>

Note that this file has ACLs.  To be a complete report, you should also
provide: getfacl java.exe as well as id output, to make sure we know
which ids have which permissions, and which id you are running as.

When you access the file via a POSIX name (such as it's relative path),
then access() uses POSIX permissions to determine who can read the file,
including checking against the ACLs.

> <Simple file name used.>
> ahall AT ahall-pc /cygdrive/c/Program Files/Java/j2sdk1.4.2_16/bin
> $ test -r java.exe && echo readable
> readable
>=20
> <Here the full path is used!>
> ahall AT ahall-pc /cygdrive/c/Program Files/Java/j2sdk1.4.2_16/bin
> $ test -r /cygdrive/c/j2sdk1.4.2_16/bin/java.exe && echo readable

But when you go through /cygdrive, then the default mount settings
assume noacl, and ACL checks are bypassed, which may change the results.

Then again, a relative path to a file within a noacl directory ought to
have the same behavior as the absolute path to the same file.  So maybe
there's a bug after all.

Would you mind also checking if /bin/test vs. bash's builtin test have
different behaviors, since coreutils and bash might be using slightly
different syscalls in implementing 'test -r'?

--=20
Eric Blake   eblake AT redhat DOT com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org


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